JSFiddle - React, Tailwind, and code Playground
JavaScript
let prevPolicyNe = 06-12-1985;
let regDateFormat = 20-10-2022;
function diff_years(dt2, dt1) {
var diff = (dt2.getTime() - dt1.getTime()) / 1000;
diff /= (60 * 60 * 24);
return Math.abs(Math.floor(diff / 365.25));
}
diff_years(regDateFormat, prevPolicyNe);